package hotLeetcode;

import java.util.Stack;

public class H2Leetcode {
    public static ListNode addTwoNumbers(ListNode l1, ListNode l2) {

        ListNode dummy = new ListNode(-1);
        ListNode cur = dummy;
        int carry  = 0;
        while (l1 != null || l2 != null) {
            int x = l1 == null ? 0 : l1.val;
            int y = l2 == null ? 0 : l2.val;

            int sum = x + y + carry;
            carry = sum / 10;
            sum = sum % 10;
            cur.next = new ListNode(sum);

            cur = cur.next;
            if (l1 != null) {
                l1 = l1.next;
            }
            if (l2 != null) {
                l2 = l2.next;
            }


        }
        if (carry == 1) {
            cur.next = new ListNode(carry);
        }

        return dummy.next;



    }

    public static class ListNode {
        int val;
        ListNode next;

        ListNode() {
        }

        ListNode(int val) {
            this.val = val;
        }

        ListNode(int val, ListNode next) {
            this.val = val;
            this.next = next;
        }
    }

    public static void main(String[] args) {
        ListNode l1 = new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, null)))))));
        ListNode l2 = new ListNode(9, new ListNode(9, new ListNode(9, new ListNode(9, null))));
        H2Leetcode.addTwoNumbers(l1, l2);


    }

}
